The Unstable Isotope ²³⁴Th Decays by β Emission with a Half-Life

question 78

Short Answer

The unstable isotope ²³⁴Th decays by β emission with a half-life of 24.5 days.The initial decay rate of the sample was 9.9 × 10¹³ Bq.(1 u = 1.6605 × 10^-27 kg)
(a)What mass of ²³⁴Th was initially present?
(b)What is the decay rate after 68 days?

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